Problem With Table setSelectable() on Vaadin 6.8.X

I’ve a problem with the setSelectable() Option in a table inside a liferay porltet.
When I add a table in a portlet and I set the setSelectable() option to true I can’t see the table on my web page
(The HTML contains only the table structure without the Headers and the values).
Otherwise, If I set setSelectable() to false I can see the table and its values.
This table is created inside a ValueChange EventListner of a NativeSelect
I tried with the version 6.8.9, 10, 11 but i can’t see the table in my portlet.
Can you help me?